Add anyref feature and type (#3109)

Adds `anyref` type, which is enabled by a new feature `--enable-anyref`. This type is primarily used for testing that passes correctly handle subtype relationships so that the codebase will continue to be prepared for future subtyping. Since `--enable-anyref` is meaningless without also using `--enable-reference-types`, this PR also makes it a validation error to pass only the former (and similarly makes it a validation error to enable exception handling without enabling reference types).

1 files changed, 8 insertions, 0 deletions

diff --git a/src/wasm/wasm-binary.cpp b/src/wasm/wasm-binary.cpp
index b78d6b86b..de82f0656 100644
--- a/src/wasm/wasm-binary.cpp
+++ b/src/wasm/wasm-binary.cpp
@@ -691,6 +691,8 @@ void WasmBinaryWriter::writeFeaturesSection() {
         return BinaryConsts::UserSections::ReferenceTypesFeature;
       case FeatureSet::Multivalue:
         return BinaryConsts::UserSections::MultivalueFeature;
+      case FeatureSet::Anyref:
+        return BinaryConsts::UserSections::AnyrefFeature;
       default:
         WASM_UNREACHABLE("unexpected feature flag");
     }
@@ -1138,6 +1140,8 @@ Type WasmBinaryBuilder::getType() {
       return Type::externref;
     case BinaryConsts::EncodedType::exnref:
       return Type::exnref;
+    case BinaryConsts::EncodedType::anyref:
+      return Type::anyref;
     default:
       throwError("invalid wasm type: " + std::to_string(type));
   }
@@ -1160,6 +1164,8 @@ HeapType WasmBinaryBuilder::getHeapType() {
       return HeapType::ExternKind;
     case BinaryConsts::EncodedHeapType::exn:
       return HeapType::ExnKind;
+    case BinaryConsts::EncodedHeapType::any:
+      return HeapType::AnyKind;
     default:
       throwError("invalid wasm heap type: " + std::to_string(type));
   }
@@ -2203,6 +2209,8 @@ void WasmBinaryBuilder::readFeatures(size_t payloadLen) {
         wasm.features.setReferenceTypes();
       } else if (name == BinaryConsts::UserSections::MultivalueFeature) {
         wasm.features.setMultivalue();
+      } else if (name == BinaryConsts::UserSections::AnyrefFeature) {
+        wasm.features.setAnyref();
       }
     }
   }